英文關鍵字
and
are
around
asteroids
astrology
astronomy
bodies
comets
consists
constellation
cosmos
design
directly
dwarf
earth
education
eight
form
galaxy
illustration
jupiter
largest
light
mercury
milky
neptune
objects
orbit
orbiting
other
planet
planetary
planets
remainder
saturn
science
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solar
space
sssbs
star
stars
such
sun
system
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universe
uranus
vector
whether
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